Retinitis pigmentosa (RP) is thought to be caused by genetic mutations in a variety of genes, many of which regulate the specification, maturation, and function of rod and cone photoreceptor cells during retinal development (e.g., Crx, Nrl, Nr2e3, Pde6a, Prph2, Ush2a, Rho, etc.) (Swaroop et al., 2010; Altschwager et al., 2017; Tsang and Sharma, 2018; Gill et al., 2019). This evidence concerns the gene RHO and retinitis pigmentosa.